Dust-guard for rollers.



PATENTED MAY 19, 1908.

E. J. MUTU. DUST GUARD EUR RULLURS. APPLICATION FILED APB.. I3, 19.04.

lll/lll/l//l/ UNITED STATES PATENT OFFICE.

EMIL JAKOB MUTH, OF BERLIN, GERMANY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO MUTH- SCHMIDT, MASCHINENFABRIK FR GURTFRDERER UND TRANSPORTANLAGEN G. M.

B. H., OF BERLIN, GERMANY.

DUST-GUARD FOR ROLLERS.

Specification of Letters Patent.

Patented May 19, 1908.

Application med April 13, 1904. serial No. 202,958.

To all whom 'it may concern.:

Be it known that I, EMM. JAKOB MUTH, a subject of the Emperor of Germany, and a resident of Berlin, Germany, have invented certain new and useful Improvements in Dust-Guards for Rollers, of which the following is a specification accompanied by drawings.

The present invention relates to rollers for conveyer bands, and has for chief object the provision of means whereby the life of the conveyer band may be prolonged by reducing the slip of the band upon the rollers to a minimum, this being effected by reducing the friction of the rollers as much as possible.

Another object of the present invention is v the simplification of the construction and arrangement of the various parts of the roller, whereby the rollers can be readily dismounted and taken to pieces when desired, and readily re-assembled. I

In the case of conveyer bands, the angle subtended at the axis of the conveyer roller by the arc of contact between the band and the surface of the roller, is so small that it is of the greatest importance to reduce the frictional resistance of the roller to' rotation to a minimum in order to prevent the slipping of the band upon the roller and thereby the wasting of the expensive bands. The employment of roller or ball bearings has hitherto been entirely out of the question, on account of the dust and dirt continually falling over the edge of the conveyer band and settling upon and penetrating into the bearings.

The present invention chiefly consists in providing conveyer rollers with roller or ball bearings and in the, combination therewith of means whereby any dust or dirt, which begins to work its way towards the roller or ball bearings is arrestedv and subsequently ejected, these means thus serving to maintain the bearings free from dust and dirt.

The invention also consists inthe 'combinations and arrangements of parts hereinafter described .and claimed. l

The embodiment of the present invention is illustrated in the accompanying drawings, in which Figure 1 is a longitudinal section of a conveyer roller. theleft-hand end of the roller shown in Fig.

Fig` 2 is an end elevation of 1. Fig. 3 is a part sectional end elevation of the rightl hand end of the said roller.

The conveyer-band roller 1 is revolubly supported by the ball bearings 2, 2 on the stationary hollow spindle 3. Each of the said ball-bearings consists of balls 4, 4 and of inner and outer ball-races 5, 6 respectively. The positions of the ball-bearings are determined by the shoulders 7, 8 on the spindle 3, against which the inner ball-races 5 abut, and by the sleeves 9, 11, the former of which abuts at one end against the lefthand ball-bearing and at the other end against the pedestal 10 supporting the lefthand end of the spindle. The sleeve l1 is provided on the spindle at the other end, and abuts at one end against the right-hand ballbearing and at the other end against the grease-box 12 which is screwed upon the end of the spindle and presses the said sleeve against the ball-bearlng.

13 is the cover of the grease-box, which is screwed upon the latter. The grease-box serves as means for forcing lubricating grease through the bearings. Shoulders 34, 35' are provided on the inner surface of the boss 23 of the roller The annular space 36 between the boss 23 and the spindle 3 communicates with the interior of the hollow spindle by means `of the holes 37, 38 formed in the spindle wall. The spindle 3 is secured in the fork 14 of the pedestal 10 by means of the cotter or pin 15, Figs. 1 and 2, which passes transversely through the fork of the pedestal and spindle7 and also through the plug 16 which serves to stop up the end of the spindle. The pin`17 holds down the right-hand end ofthe spindle 3 in the fork 18 of the pedestal 19, which is preferablypart of the s arne casting as the pedestal 10 and the base 20.

The pin 17 passes immediately over the' sleeve 11 which rests. in the fork 18.

21, 22 are two dust-traps or dust-ejectors, which are screwed on .the ends of the boss 23 of the roller. These dust-traps looselysurround the sleeves 9, 11, a small interval eX- isting between each sleeve and the internal adjacent cylindric surfaces of the corresponding trap. The sleeves, as far as the dusttraps are concerned, may be consldered as part of the spindle. The traps possess ringsha ed recesses 24, 25, the inner recess 24 of eacli trapv being connected by means of a the surfaces of ,away from the axis of the pindle,

31, Fig. 3, whic dust and dirt into the spaces 28 between the. pedestals and the traps 21, 22, dprotecting caps 29, 30y are mounted upon sai pedestals 10, 19'respectively. These two caps are similar lto one another, with the exception that the cap 3() is rovided with the recess h allows the ca to straddle the sleeve 11. Each cap has a ront wallf32 which extends into the mterior of the roller where it is bent upwards and outwards.` The two side walls or wings 33 likewise project towards the interior of the roller where theyL are bent outwards, so that the fork is inclosed or envelo ed as completely as possible by the cap. l` e above mentioned ins 15, 17 which pass throu h the walls of t 1e caps, serve to' secure the atter on the pedestals.

When the roller is in workin condition, the grease-box, the hollow spin le, and the s ace 36 betweenthe boss 23 and the spine, is iilled with lubricating grease or fat. On screwing in the grease-box cover 13, the grease is forced through the holes 37, 38 in the spindle and through the ball-bearings 2, 2

after passing through which it enters the open ends of the rotating dust-traps 21, 22, passes through the (passages 26, into the inner recesses 24, an thence between the traps and the sleeves 9, 11respeotively, large outer recesses 25, 25 from which the grease or fat, together with the dust or dirt which' it has taken, u in passing over the sleeves is ejected throug the passages 27 27 by Ineans of centrifugal force, sai passages being, for the purpose of allowin this centrifugal action to take place, directe away from the axis as above described. These dust-traps thus form means producing a plurality of constrictions ofthe into the comparatively annular space 36 between the boss and the parts earned by the spind e,

spindle, these constrictions being always'y occupied by the lubricatingl grea`se or 'fat on its` passage from the bearings outwards. B

these means it is thus rendered impossib e for dust or dirt arising from the conveyor to enter as far as the ball-bearings, as any dust or dirt entering the ejecting `traps 21, 22 `is' ejected throughthe passages 27, 27.

By removing the pins 15 17, it will be observed, the spindle 3 with the roller mounted thereon can be' lifted out of the forks, and the whole can at once be taken to pieces. The pin 15 and the pedestal 10y thus not only serve to fix thespindle 3, but also to maintain the correct assembla e of the various the removal of said pin andof the pin 17 allowing all the yvention is indicated b c. g., by the term Hbal bearings as used 1n roller,

' chamber o the roller,

arts to be dismounted. The parts can also e reassembled with the greatest ease.

lt is of course to be understood, that my invention is not limited to the particular construction and arran ement of parts shown in the drawings, but tiat the scope of my inthe claims. Thus,

the claims I intend of course to include rollers which are well known mechanical equivalents of the balls.

What 'l claim isam j 1. The combination of a roller having an annular chamber extending inward from each end thereof, a hollow spindle fori-cedingv lubricant to the roller, journal bearings for said roller, a dust trap connected with each end of the roller and surrounding the hollow spindle, and dirt into said bearings, and a dust cap at each end of said roller, each of said dust caps extending at its upper end into thel adjacent annular chamber oi' the roller.

2. The combination of a roller having an annular chamber extending inward from each end thereof, journal bearings for said roller, and a dust cap at each end of said each of said dust caps extending at its upper end into the ad'acent annular chamber of the roller, where y to protect the journal bearings.

3. The combination of a roller having an annular chamber extending inward freni each end thereof, a stationary hollow spindle having perforations for feeding lubricating materia to the roller, a closing cap on one end of said spindle, a dust ca fitting across the opposite end of said spint l and extending at its u per end into the adjacent annular and a secondeap slotted to straddle the spindle adjacent t0 the closin cap and fitting at its upper end into the a 'acent annular chamber of the roller. 4. e combination with a roller having a stationa hollow spindle for feeding lubricant to t e roller, of a dust trap connected with' each end of the roller and surrounding the hollow spindle, each dust trap having a plurality of annular recesses opening onto the spindle and connected with each other by small passages, the outer annular recess having one or more outlet passages directed ,away from the axis of the spindle so as to cause the exit of lubricating material by centrifugpl force.

5. he combination of a roller having a hollow boss, a hollow stationary spindle, provided with holes assing throu h the same sleeves on said spindle, pedesta s each provided with a fork for su porting said spindle, ball bearings arranged etween the boss and the spindle and revolubly supporting the roller'on the s indlg, thereb forming an annular space etween the oss and vthe spindle, dust traps having a plurality of cir-- ball bearings arranged the spindle and revolubly supporting the roller on lthe spindle, thereby forming an anvided with holes'passing through the same,

cular grooves and passages connecting said grooves' with said annular space between each bearing and the correspondingi end of the spindle; means for -forcing lubricating grease through the bearings whereby the grease is forced to pass from the bearings and to be finally ejected, carrying with it any dust or dirt which may Ihave found entrance.

6. The combination of a roller having a hollow boss, a hollow stationary spindle prosleeves on said spindle,l pedestals each providedlwith a fork for su porting saidspindle, etween the boss an'd nular space between the boss and the spin-A dle, dustvtraps having a plurality of circular grooves and passages connecting said grooves with said annular space between each bearing and the corresponding end of the spindle, a hollow nut at the hollow end of said spindle for forcing lubricating grease through the` bearings whereby the grease 1s forced to pass through the holes in the hollow spindle into the hollow boss and then through the bearings to be finally ejected through said circular grooves.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

WOLDEMAR HAUPT, HENRY HAsPER. 

